18 Messages

Thursday, December 25th, 2025 1:52 AM

US power too high

US power levels have increased significantly over the past 5 to 6 weeks. The CMTS needs to be polled to make sure it’s not equipment ( Xfinity ) related. Only 1 (2) way splitter installed, no amps or other add ons. Info signals were right around 40-41,,,now it’s 49.5-50…out of spec. This is upstream ,,downstream and correctable/uncorrectable,,not an issue at his time. I suspect equipment problem somewhere within the plant,,close by, other than having a tech come out and not have a solution,,I am respectfully requesting a hard look at the CMTS.

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Expert

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115.1K Messages

2 hours ago

Yes. It's my pleasure ! The acceptable modem signal values are in this self troubleshooting tips post that is pinned at the top of this board;

https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0 

Contributor

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282 Messages

@EG​ with reference to the troubleshooting post above, I'm trying to figure out some issues with my Netgear CM3000. It's been fine since last May (5/25), with my 1.3 Gbps plan. In the post, it has a section on Check your Signal Levels. Can you tell me if the Downstream Power Level & Downstream Signal to Noise Ratio values pertain to the OFDM channels? In my case, besides some other issues, I'm experiencing only able to get 1 Gbps. This appears to be due to the fact that I only have 32 QAM channels locked, without the usual (single) OFDM channel locked. The Power & SNR looks a little wonky. Power is -21 dBmV & SNR is 23.5 dB.

Official Employee

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1.2K Messages

3 days ago

Hello @user_xxlt6b, We can certainly help escalate the local team to check the plant and node if needed. But what other troubleshooting have we already completed and ruled out? Have you already had techs out to the property?

Expert

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115.1K Messages

3 hours ago

@user_xxlt6b @XfinityJustinC 

Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.

18 Messages

EG,,I realize you have undoubtedly stated this many times before, but to humor me just this time sir,,what are the exact downstream and upstream power levels that are expectable for Xfinity internet/ tv service,,please and thank you for all you do…

Expert

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115.1K Messages

59 minutes ago

@plumld 

Please create a new topic of your own here on this board detailing your issue, and we'll take it from there. Thanks.

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